content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  
  import protobuf_unittest.UnittestProto;
  import java.io.IOException;
  import junit.framework.TestCase;
  
  /**
   * Tests to make sure the lazy conversion of UTF8-encoded byte arrays to
   * strings works correctly.
   *
   * @author jonp@google.com (Jon Perlow)
   */
  public class LazyStringEndToEndTest extends TestCase {
  
    private static ByteString TEST_ALL_TYPES_SERIALIZED_WITH_ILLEGAL_UTF8 =
        ByteString.copyFrom(new byte[] {
            114, 4, -1, 0, -1, 0, -30, 2, 4, -1,
            0, -1, 0, -30, 2, 4, -1, 0, -1, 0, });
  
    private ByteString encodedTestAllTypes;
  
    @Override
    protected void setUp() throws Exception {
      super.setUp();
      this.encodedTestAllTypes = UnittestProto.TestAllTypes.newBuilder()
          .setOptionalString("foo")
          .addRepeatedString("bar")
          .addRepeatedString("baz")
          .build()
          .toByteString();
    }
  
    /**
     * Tests that an invalid UTF8 string will roundtrip through a parse
     * and serialization.
     */
    public void testParseAndSerialize() throws InvalidProtocolBufferException {
      UnittestProto.TestAllTypes tV2 = UnittestProto.TestAllTypes.parseFrom(
          TEST_ALL_TYPES_SERIALIZED_WITH_ILLEGAL_UTF8);
      ByteString bytes = tV2.toByteString();
      assertEquals(TEST_ALL_TYPES_SERIALIZED_WITH_ILLEGAL_UTF8, bytes);
  
      tV2.getOptionalString();
      bytes = tV2.toByteString();
      assertEquals(TEST_ALL_TYPES_SERIALIZED_WITH_ILLEGAL_UTF8, bytes);
    }
  
    public void testParseAndWrite() throws IOException {
      UnittestProto.TestAllTypes tV2 = UnittestProto.TestAllTypes.parseFrom(
          TEST_ALL_TYPES_SERIALIZED_WITH_ILLEGAL_UTF8);
      byte[] sink = new byte[TEST_ALL_TYPES_SERIALIZED_WITH_ILLEGAL_UTF8.size()];
      CodedOutputStream outputStream = CodedOutputStream.newInstance(sink);
      tV2.writeTo(outputStream);
      outputStream.flush();
      assertEquals(
          TEST_ALL_TYPES_SERIALIZED_WITH_ILLEGAL_UTF8,
          ByteString.copyFrom(sink));
    }
    
    public void testCaching() {
      String a = "a";
      String b = "b";
      String c = "c";
      UnittestProto.TestAllTypes proto = UnittestProto.TestAllTypes.newBuilder()
          .setOptionalString(a)
          .addRepeatedString(b)
          .addRepeatedString(c)
          .build();
  
      // String should be the one we passed it.
      assertSame(a, proto.getOptionalString());
      assertSame(b, proto.getRepeatedString(0));
      assertSame(c, proto.getRepeatedString(1));
  
  
      // Ensure serialization keeps strings cached.
      proto.toByteString();
  
      // And now the string should stay cached.
      assertSame(a, proto.getOptionalString());
      assertSame(b, proto.getRepeatedString(0));
      assertSame(c, proto.getRepeatedString(1));
    }
  
    public void testNoStringCachingIfOnlyBytesAccessed() throws Exception {
      UnittestProto.TestAllTypes proto =
          UnittestProto.TestAllTypes.parseFrom(encodedTestAllTypes);
      ByteString optional = proto.getOptionalStringBytes();
      assertSame(optional, proto.getOptionalStringBytes());
      assertSame(optional, proto.toBuilder().getOptionalStringBytes());
  
      ByteString repeated0 = proto.getRepeatedStringBytes(0);
      ByteString repeated1 = proto.getRepeatedStringBytes(1);
      assertSame(repeated0, proto.getRepeatedStringBytes(0));
      assertSame(repeated1, proto.getRepeatedStringBytes(1));
      assertSame(repeated0, proto.toBuilder().getRepeatedStringBytes(0));
      assertSame(repeated1, proto.toBuilder().getRepeatedStringBytes(1));
    }
  }
  